&GAS: ADD
Can be any of the following:
----------------------------------------------------------------------
Item Explanation
----------------------------------------------------------------------
ATTACHMENT-COEFFICIENT Attachment coefficient/pressure, in 1/cm.Torr
DRIFT-VELOCITY Drift velocity in cm/microsec
ION-MOBILITY Ion mobility, in cm2/microsec.V
LONGITUDINAL-DIFFUSION Longitudinal diffusion * sqrt(pressure),
cm*sqrt(Torr) for 1 cm of drift
LORENTZ-ANGLE Lorentz angle, in degrees
TOWNSEND-COEFFICIENT Townsend coefficient/pressure, in 1/cm.Torr
TRANSVERSE-DIFFUSION Transverse diffusion * sqrt(pressure),
cm*sqrt(Torr) for 1 cm of drift
----------------------------------------------------------------------
Note that the same scalings have to be applied as for the TABLE.
The function may depend on the following variables:
----------------------------------------------------------------------
Variable Meaning Unit
----------------------------------------------------------------------
ATTACHMENT Attachment coefficient / p 1/cm.Torr
COS_EB Cosine of angle between E and B -
EP Electric field / p V/cm.Torr
LORENTZ Lorentz angle degrees
MOBILITY Ion mobility cm2/microsec.V
SIGMA_L Longitudinal diffusion * sqrt(p) cm*sqrt(Torr) per cm
SIGMA_T Transverse diffusion * sqrt(p) cm*sqrt(Torr) per cm
TOWNSEND Townsend coefficient / p 1/cm.Torr
VELOCITY Electron drift velocity cm/microsec
----------------------------------------------------------------------
The variable EP can always be used, COS_EB should only be used in
2-dimensional tables i.e. when Magboltz has prepared the transport
tables in the presence of a a magnetic field. The transport properties
should be used only insofar as they have been entered already.
If you wish to add experimental data to a table, you should prepare
2 vectors: one that contains the E/p values of the measurements and
one that contains the quantities measured.
The E/p vector must cover the entire range of the table - no attempt
is made to extrapolate the data you provide.
The E/p values in your measurements do not have to coincide with the
E/p values present in the table - your measurements will be
interpolated at the values of the table and these interpolations are
stored instead of the actual measurements.
Selects the degree of polynomial interpolation in the pair of vectors.
When the data is smooth, a value of 2 (quadratic interpolation) is a
good choice. This may however lead to intermediate points with a
negative value in for instance Townsend coefficient tables that
usually start at 0. For such tables, linear interpolation is advised.
Instead of ORDER 1, you may also type LINEAR. QUADRATIC is a synonym
for ORDER 2, CUBIC for ORDER 3.
Keyword index.
Formatted on 10/11/98.